One replacement 1-3/4" X 20 Spline replacement PTO 4 friction disc heavy duty slip clutch. rated 6280-16460 in.-lb. or 520-1370 ft.-lb. of torque. Accepts standard Series 6 Cross and bearing kit ( 30.2mm X 92mm) . Complete ready to install new slip clutch. Specifcations: Friction disc OD: 160mm or 6.29" Overall Slip Clutch OD 7-1/2" Clutch Hub: 1-3/4" X 20 Spline with two cinch bolts Fits Series 6 Metric Cross and Bearing ( 30.2mm X 92mm)